Space

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Across
  1. 2. A line around which any body or object rotates.
  2. 4. Earth's only natural satellite.
  3. 6. A circular movement of an object around a centre or point of rotation.
Down
  1. 1. The star at the centre of the Solar System.
  2. 3. A massive, bright sphere of plasma held together by its own gravity
  3. 5. The path of an object around a particular point in space.